Priority Valve
优先阀可确保机油压力首先用于转向和制动。 然后，机油压力供给变速箱操作之用。 优先阀设置为在压力达到 2895 kPa (420 psi) 时与变速箱控制装置接通。
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| 图 1 | g00369532 |
来自动力传动系机油泵变速箱充油段的机油通过变速箱机油滤清器流至进口 (5) 。 机油通过进口 (5) 流至出口 (4) 。 然后，这些机油流至转向和制动控制阀以及优先阀。 在优先阀中，机油通过阀芯组件 (6) 中的一个孔流入提升阀 (8) 和缓动阀 (7) 之间的油室。 此时，压力油可以克服弹簧力使阀芯组件 (6) 向右移动。 当油室中的机油压力高于弹簧力时，阀芯组件 (6) 就会移动。 阀芯的移动可以使压力油流至出口通道 (1) 。 压力油从出口通道 (1) 流至变速箱选择器和压力控制阀。
Caterpillar Information System:
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